Heterocyclic OLED Layer Composition for Low-Voltage Light Emission
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Solution Overview
Problem
Existing organic light emitting devices face challenges in enhancing performance, lifetime, and efficiency of organic thin film materials.
Innovation Solution
A heterocyclic compound represented by Chemical Formula 1 is used in the organic material layer, which can function as a hole injection layer material, hole transport layer material, light emitting layer material, or electron transport layer material, thereby lowering the driving voltage and improving light emission efficiency and lifetime properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic thin film materials are used, then the device structure is simple, but the performance, lifetime, and efficiency are insufficient
Solution Approach 1:
The patent employs composite material design by combining multiple functional groups within a single heterocyclic compound molecule. The compound integrates electron-accepting units (Y1-Y3 containing N atoms), electron-donating units (Ar1, Ar2 aryl or heteroaryl groups), and various substituents (R1s, R2-R9) that can be independently optimized. This molecular-level composite structure enables simultaneous achievement of high electron mobility, stable HOMO/LUMO levels, and improved device lifetime without increasing device structural complexity
Solution Approach 2:
The patent systematically optimizes molecular parameters including the types of heteroatoms (Y1-Y3 being CH or N with at least one N), the nature of aromatic groups (Ar1, Ar2 as C6-C60 aryl or C2-C60 heteroaryl), the substituents (R1s, R2-R9 from multiple chemical groups), and the positions/n1, n2, n3 of these groups. By varying these chemical parameters, the compound's electronic properties (HOMO/LUMO levels, electron mobility, triplet energy) are tuned to achieve superior device performance and lifetime
2Productivity
If conventional organic thin film materials are used, then the manufacturing process is simple, but the light emission efficiency is low
Solution Approach 1:
The patent applies local quality optimization by assigning specific functional groups to specific positions within the molecular structure. The heteroatoms Y1-Y3 are placed in specific rings to create electron-accepting zones, while Ar1 and Ar2 are positioned to provide electron-donating regions. The substituents R1s, R2-R9 are strategically placed at different positions (indicated by subscripts) to locally adjust electronic properties, steric effects, and molecular packing. This localized functional distribution enables high light emission efficiency while maintaining reasonable synthetic accessibility through modular assembly
Solution Approach 2:
The patent segments the molecular structure into distinct functional modules: the core heterocyclic ring system (Y1-Y3), the aromatic substituents (Ar1, Ar2), the alkyl/alkenyl/alkynyl linkers (L1, L2), and various terminal groups (R1s, R2-R9). Each module can be independently designed, synthesized, and then assembled into the final compound. This segmentation approach facilitates systematic optimization of light emission properties while simplifying the overall manufacturing process through modular synthesis strategies
3Use of energy by moving object
If the driving voltage is reduced to improve efficiency, then the energy consumption decreases, but the performance may be compromised
Solution Approach 1:
The patent optimizes the compound's electronic parameters (HOMO and LUMO energy levels, electron mobility, triplet energy) to achieve low driving voltage operation. By adjusting the heteroatom composition (Y1-Y3), aromatic group types (Ar1, Ar2), and substituent patterns (R1s, R2-R9), the energy level alignment between the organic material and electrodes is optimized, reducing energy barriers for charge injection and transport. This enables low driving voltage while maintaining high electron mobility and stable operation, thus preserving device performance
Solution Approach 2:
The patent designs composite molecular structures that simultaneously provide multiple beneficial properties: electron-accepting units (Y1-Y3 with N atoms) for high electron mobility, electron-donating units (Ar1, Ar2) for appropriate HOMO/LUMO levels, and various substituents (R1s, R2-R9 including deuterium, halogens, cyano groups, and different hydrocarbon groups) for enhanced stability and optimized energy levels. This composite structure enables low driving voltage operation without compromising device reliability or performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The heterocyclic compound enhances the performance and longevity of organic light emitting devices by reducing the driving voltage and increasing light emission efficiency.
Implementation Method 1
When a voltage is applied to the organic light emitting device having such a structure, electrons and holes injected from the two electrodes bind and pair in the organic thin film, and then light is emitted as these annihilate
Data Source
AI summary
Provided is a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device including the heterocyclic compound represented by Chemical Formula 1, and a composition for an organic material layer. Each substituent of Chemical Formula 1 has the same definition as described in the description of the disclosure.